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Measurements & InstrumentationIndustrial Instrumentation

In a 4-20 mA industrial current loop, the value 4 mA commonly represents?

  • ALive zero or lower-range value
  • BFull-scale value
  • CPower failure by definition
  • DExactly 25% of every physical quantity
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Correct Answer: A. Live zero or lower-range value
Explanation: The 4 mA lower endpoint is a live zero, helping distinguish a valid minimum reading from certain fault conditions such as an open loop.
Reference: Standard measurements and instrumentation: industrial instrumentation
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